If you are having an error specifically with part11.rar , it is likely a "Checksum Error" or "Corrupt Volume." This usually means that specific file didn't download correctly. Most repacks include a .sfv file or a "Verify BIN files" tool to check which part is broken.
If you encounter errors during extraction, the most common fix is to (Part 11) or use the "Repair" function in WinRAR if the uploader included recovery records. The Sims 4 -- fitgirl-repacks.site --.part11.rar
You cannot open or use part11.rar by itself. You must have every single part (from part 01 to the final part) in the same folder for the extraction to work. If you are having an error specifically with part11